Hi, i try to figure out question which Ransac model to use, when you shooting with 600mm lens on panoramic gear.I would like to know it, because none of panoramic gear can not rotate around the nodal point 600 mm lens.And in this case I am inclined to homography. Am i right ?

With a 600mm focal length, similarity is fine. Imagine you have a 600mm image of an object, a building facade looking straight. To be able to justify homography, it would mean that you need to change the shooting location so that the same building facade is now looking oblique. with an angle. That means you just moved perhaps 200 m or even more than that. Homography is here to help to stitch surfaces that you see from different angles.